to make a sohc make 400hp......money i mean, you can take half of that an make a b series /hseries hit 500-650 hp homie, an have less money then making a sohc to handle 400 hp!!!! the all motor record was like 215 hp.......am off on exact number but am close...... an it cost hella lot to make that,,,, dont waste your time with sohc.... unless your broke.......the reason why ppl do ls turbo then gsr turbo is they are broke... but you put equal amount of money into them an tune the right!!! gsr will walk on the ls...... that is the same with sohc...take to equal amount sohc/an dohc..n the dohc will walk.... i dont care who you are!!!!!!